using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string sampleString=null;//=Console.ReadLine();

        if (string.IsNullOrEmpty(sampleString))

        {

              sampleString = "cqrsrsqqccqs";

        }

        var encodedResult = "";

        Enumerable.Range(0, sampleString.Length / 3).Select(i => sampleString.Substring(i * 3, 3)) //we can use sampleString.Chunk(3) instead

                 .Select(s => s.Select(ss => ss == 'c' ? 3 : ss == 'q' ? 1 : ss == 'r' ? 2 : 0).Sum().ToString()).ToList()

            .Select(s => encodedResult += s).ToList();

​

        Console.WriteLine(encodedResult);

    }

}